Walking into MIT’s Media Lab is like walking into a digital candy store. On the third floor, you're greeted by an HD display with “Emotional Weather” (data mined from Twitter using an intelligent agent that shows you the emotional content of tweets on any given topic).

Zack Lynch is author of The Neuro Revolution: How Brain Science Is Changing Our World (St. Martin's Press, July 2009). Neurotechnology is the emerging science of brain imaging and other new tools for both understanding and influencing our brains.

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